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Connecting PHP to MySQL on Bluemix

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Connecting PHP to MySQL on Bluemix

In this post we take a quick look at how you can connect your PHP application to a MySQL instance running on Bluemix. Read on for the details.

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Most of the PHP I write runs on Bluemix - it's IBM's self-service cloud, and since I work there, they pay for my accounts. There are a bunch of databases you can use there, mostly open source offerings, and, of course, with PHP I like to use MySQL. Someone asked me for my connection code since it's a bit tricky to grab the credentials that you need, so here it is.

Bluemix Environment Variables

In Bluemix, you can simply create a MySQL database (look for "compose-for-mysql" in the catalog), create a set of credentials, and then bind it to your app. I should blog a few more of my PHP-on-Bluemix tricks but you can run a selection of PHP versions and it's also possible to add the extensions that you need. I have found it does have what I need once I figure out how to configure it!

Once the database is bound to the application, then your PHP code running on Bluemix will have an environment variable called VCAP_SERVICES. The variable contains a JSON string, with top-level elements for each of the services that are bound to your application. Services will usually be the databases you are using, but could also be some of the APIs, for example.

I like to decode VCAP_SERVICES to an array so I can work with it, like this:

$vcap_services = json_decode($_ENV['VCAP_SERVICES'], true);

Get PDO Connected

To connect to PDO with MySQL, we need to supply a few different values:

  • host
  • port
  • username
  • password
  • database name

The VCAP_SERVICES supplies a URL containing all those elements, but not splitting them out. The PHP function parse_url() can help us with this. Here's the full code block that I use to connect in my applications:

$vcap_services = json_decode($_ENV['VCAP_SERVICES'], true);
$uri = $vcap_services['compose-for-mysql'][0]['credentials']['uri'];
$db_creds = parse_url($uri);
$dbname = "your_database_name";

$dsn = "mysql:host=" . $db_creds['host'] . ";port=" . $db_creds['port'] . ";dbname=" . $dbname;
$db = new PDO($dsn, $db_creds['user'], $db_creds['pass']);


Hopefully, you can just borrow the code above and quickly get started with your own PHP/MySQL applications.

Before you go: Was this helpful? Confusing? Annoying and you'd rather have it as a library you can just pull in with Composer (I can do that if I know you'd find it useful)? Please leave me a comment so I know!

Take a look at the Indigo.Design sample applications to learn more about how apps are created with design to code software.

Topics:
mysql database ,php ,bluemix ,web dev

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